condition mean min max ZT0-3 10.26927 10.26927 10.26927 ZT4-7 12.41503 12.41503 12.41503 ZT8-11 11.329232999999999 11.329232999999999 11.329232999999999 ZT12-15 11.6495405 11.6495405 11.6495405 ZT16-19 14.963891 14.963891 14.963891 ZT20-23 12.967496 12.967496 12.967496